38 cm SK C/34 naval gun

38 cm SK C/34 naval gun

38 cm turret of Batterie Vara, Kristiansand, Norway
Type Naval gun, Railroad gun and Coastal defense
Place of origin Germany
Service history
In service 1940–45
Used by Nazi Germany
Wars World War II
Production history
Designer Krupp
Designed 1936—39
Manufacturer Krupp
Specifications
Weight 111 tonnes (109 long tons; 122 short tons)
Length 19.63 m (64 ft 5 in)
Barrel length 18.405 m (60 ft 4.6 in) L/48
Shell separate-loading, case charge
Caliber 380 millimetres (15 in)
Breech horizontal sliding block
Recoil hydro-pneumatic
Elevation -5.5° to +30°
Traverse up to 360°
Rate of fire 2.5 rpm
Muzzle velocity 820 m/s (2,700 ft/s)
Effective firing range 36.5 km (22.7 mi) with 800 kg (1,800 lb) shell at 30° elev.

The 38 cm SK C/34[Note 1] naval gun was developed by Germany mid to late 1930s. It armed the Bismarck-class battleships and was planned as the armament of the O-class battlecruisers and the re-armed Scharnhorst-class battleships. Six twin-gun mountings were also sold to the Soviet Union and it was planned to use them on the Kronshtadt-class battlecruisers, however they were never delivered. Spare guns were used as coastal artillery in Denmark, Norway and France. One gun is currently on display at Møvig Fortress outside Kristiansand.

Ammunition

It used the standard German naval system of ammunition where the base charge was held in a metallic cartridge case and supplemented by another charge in a silk bag. Both cartridges were rammed together.

Propellant charge[1]

Main charge: 38 cm HuelsKart34 -GefLdG- 108 kg (238 lb) RPC 38 (16/7)

Fore charge: 38 cm VorKart34 -GefLdG- 104 kg (229 lb) RPC 38 (16/7)

Shell

38 cm UXO from Tirpitz found in the Ullsfjorden in Norway.

Four types of shells were used by the 38 cm SK C/34 although the Siegfried-Granate could only be used by the coast defense versions. Almost 40 per-cent lighter, this latter shell could be fired with a reduced charge at 920 metres per second (3,000 ft/s) to 40 kilometres (44,000 yd). With a full charge it reached 1,050 metres per second (3,400 ft/s) and could travel 55.7 kilometres (60,900 yd)–equivalent to over 34.5 miles.[2]

Shell name Weight Filling Weight Muzzle velocity Range
nose-fused HE shell with ballistic cap (38 cm Spgr. L/4.6 m Kz (m.Hb) 800 kg (1,800 lb) Unknown 820 m/s (2,700 ft/s) 35.6 km (22.1 mi) at 30°
base-fused HE shell with ballistic cap (38 cm Spgr L/4.5 Bdz (m.Hb)) 800 kg (1,800 lb) Unknown 820 m/s (2,700 ft/s) 35.6 km (22.1 mi) at 30°
base-fused AP shell with a ballistic cap (Psgr L/4.4 BdZ (m.Hb)) 800 kg (1,800 lb) Unknown 820 m/s (2,700 ft/s) 35.6 km (22.1 mi) at 30°
nose- and base-fused HE shell with ballistic cap (Si-Gr L/4.5 Bdz u. Kz (m.Hb)) (light load) 495 kg (1,091 lb) 69 kg (152 lb) TNT 920 m/s (3,000 ft/s) 40.0 km (24.9 mi)
nose- and base-fused HE shell with ballistic cap (Si-Gr L/4.5 Bdz u. Kz (m.Hb)) (full load) 495 kg (1,091 lb) 69 kg (152 lb) TNT 1,050 m/s (3,400 ft/s) 55.7 km (34.6 mi)

Naval gun

The data given is according Krupp datasheet 38 cm S.K.C/34 e WA52-453(e). This gun was mounted in pairs in the Drh.L. C/34e turret which allowed elevation from -5° 30' to +30°.[3] Each gun had an individual cradle, spaced 3.5 metres (11 ft) apart, but they were normally coupled together. In general the turret was hydraulically powered, but the training gear, auxiliary elevation, auxiliary hoists and some loading gear was electrically powered. The turrets weighed 1,048 tonnes (1,031 long tons; 1,155 short tons) to 1,056 tonnes (1,039 long tons; 1,164 short tons),[4] rested on ball bearings on a 8.75 metres (28.7 ft) diameter track, could elevate 6° per second and traverse 5.4° per second. The guns were loaded at +2.5° and used a telescoping chain-operated rammer. According to German manuals [3] the required permanent capacity for the loading equipment for ammunition was 2.5 shells per minute. During testing period at the Baltic Sea the AVKS Report states an output of the ammunition delivery system up to 3.125 shells per minute.[5] Under battle conditions Bismarck averaged roughly one round per minute in her battle with HMS Hood and Prince of Wales.[6]

Turret armor

location thickness location thickness
face 36 cm (14 in) front and rear sloping roof 18 cm (7.1 in)
sides 22 cm (8.7 in) side sloping roof 15 cm (5.9 in)
rear 32 cm (13 in) flat roof 13 cm (5.1 in)

Numbers

Sixteen guns were used for the Bismarck and Tirpitz and six were ordered for the Gneisenau when it was to be re-armed in 1942. Six were intended for each of the O-class battlecruisers, but it is uncertain how many of these last were actually delivered. Six mountings with twelve guns were sold to the Soviet Union who planned to use them on two Kronshtadt-class battlecruisers, but these were never delivered. Surplus guns were used as coast defense guns.

Coast defense gun

Model of the 38 cm SK C/34 emplacement at Hanstholm

These guns were modified with a larger chamber for coast defense duties to handle the increased amount of propellant used for the special long-range Siegfried shells.[7][8] Gander and Chamberlain quote a weight of only 105.3 tonnes (103.6 long tons; 116.1 short tons) for these guns, presumably accounting for the extra volume of the enlarged chamber.[9] An armored single mount, the Bettungsschiessgerüst (Firing platform) C/39 was used by these guns. It had a maximum elevation of 60° and could traverse up to 360°, depending on the emplacement. The C/39 mount had two compartments; the upper housed the guns and their loading equipment, while the lower contained the ammunition hoists, their motors, and the elevation and traverse motors. The mount was fully powered and had an underground magazine.[10] Normally these were placed in open concrete barbettes, relying on their armor, but Hitler thought that there was not enough protection for the guns (Battery Todt) emplaced on Cap-Gris-Nez in the Pas de Calais near Wimereux and ordered a concrete casemate 3.5 metres (11 ft) thick built over and around the mounts. This had the unfortunate effect of limiting their traverse to 120°.[11] Other C/39 mounts were installed at the Hanstholm fortress in Denmark, and the Vara fortress in Kristiansand, Norway.

Four Drh LC/34 turrets, three of which were originally intended to re-arm the Gneisenau and one completed to the Soviet order, modified for land service, were planned to be emplaced at Paimpol, Brittany and on the Cap de la Hague on the Cotentin Peninsula, but construction never actually began.[12] Construction for two of those turrets was well underway at Oxby, Denmark when the war ended.[13][14]

Railroad gun

Main article: 38 cm Siegfried K (E)

Some guns also saw service as 38 cm Siegfried K (E) railroad guns, one of these being captured by American forces during the Rhône Valley campaign in 1944.[15]

See also

Weapons of comparable role, performance and era

Footnotes

Notes
  1. ↑ SK - Schnelladekanone (quick loading cannon); C - Construktionsjahr (year of design)
Citations
  1. ↑ M.Dv.Nr.185 p. 6
  2. ↑ Hogg, pp. 242-3
  3. 1 2 Bauvorschrift fuer den Schiffskoerper p. 64 SI 48
  4. ↑ Bauvorschrift fuer den Schiffskoerper p. 52 SI 33
  5. ↑ AVKS-700 Schlußbericht p. 19 Hauptaufzuege
  6. ↑ Campbell, pp. 229-30
  7. ↑ http://www.navweaps.com/Weapons/WNGER_15-52_skc34.htm Chamber volume increased from 19,467 in3 (319 dm3) to 22,072 in3 (361.7 dm3), rifling length reduced from 629.2 in. (15.982 m) to 620 in (15.748 m)
  8. ↑ Campbell, p. 229
  9. ↑ Gander and Chamberlain, p. 272
  10. ↑ Hogg, p. 242
  11. ↑ Gander and Chamberlain, p. 256
  12. ↑ Gander and Chamberlain, p. 259
  13. ↑ "Germany 38 cm/52 (14.96") SK C/34". 2 April 2009. Archived from the original on 17 April 2009. Retrieved 27 April 2009.
  14. ↑ Rolf, Rudi (1998). Der Atlantikwall: Bauten der deutschen Küstenbefestigungen 1940–1945. Osnabrück: Biblio. p. 315. ISBN 3-7648-2469-7.
  15. ↑ François, p. 75

References

Service manuals and publications

Literature

External links

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